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Homework Help: Rock Tossed Into the Air

  1. May 25, 2006 #1
    Hello, if someone could help me with the second part of this problem, I would be so grateful.

    A rock is tossed straight up with a velocity of + 20 m/s When it returns, it falls into a hole 10 m deep.

    What is the rock's velocity as it hits the bottom of the hole?
    I got -24.4 m/s for this.

    How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
    This is what I have no idea how to figure out.

    Any help you can give me would be much appreciated. :biggrin:
  2. jcsd
  3. May 25, 2006 #2
    Well what equations do you use to describe the object's trajectory as a function of time ?

  4. May 25, 2006 #3
    Dont you need the a (or g) value to work this out as the object falls freely on the descend?
  5. May 25, 2006 #4
    The acceleration is indeed the g-vector.


    ps : check out this TUTORIAL

    The answer you are looking for is right in there
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